Hi! Looking for exit/re-entry knowledge. My (USA) visa exemption extension in Thailand is maxed out and ends April 19 (+30 days then + 7 days)

--What is the easiest/time/cost efficient and reliable method to exit and entry country if I wanted to stay another 30 days or less -- that doesn't risk denial at re-entry or put eyes on my passport down the road? I plan to come back and be here often (a few months a year). I tried to the ask the immigration officers at the extension office, but they just said any exit/entry is fine. Other info I've seen is very anecdotal and I'm looking for more definitive info from those with knowledge.

I also came for exactly 1 month last april/may and <30 days in December via air.

--Would I have to leave for at least 48-72 hours or can I fly to, say Cambodia in the morning, stay in the airport a few hours, and fly back in the afternoon/evening without having to worry?

--I'd prefer to spend 100+USD For a short flight than take a longer bus ride but I'm open to a bus if for whatever reason that is better/more reliable.

--I already have a fully refundable award ticket back to NYC on the 19th, but it would be nice to stay another week or two or three if it's easy enough to reset.

Thank you for help.